Summary
This study investigated whether restricting movement of woolly apple aphid between root and canopy populations could reduce pest persistence and abundance. Counterintuitively, sticky barriers that blocked upward movement to canopies did not reduce aphid colonies and instead increased late-season colony counts, partly because barriers also excluded earwig predators. However, greenhouse trials suggested that sandier potting media and mulch applications reduced root feeding damage, indicating that soil conditions may offer partial protection against below-ground pest populations.
UK applicability
The findings are relevant to UK apple production, as woolly apple aphid is a significant pest in British orchards. The results suggest that physical barriers alone are ineffective due to unintended exclusion of beneficial natural enemies, and that soil management practices (sand content and mulching) warrant investigation as part of integrated pest management strategies in UK apple production systems.
Key measures
Aphid colony counts in tree canopies; root galls (indicative of aphid feeding); predator abundance; effects of sticky barriers, mulches (wood chips and paper slurry), and sand amendments on aphid populations
Outcomes reported
The study evaluated the effectiveness of restricting woolly apple aphid movement between root and canopy populations using sticky barriers in field trials and mulch/sand amendments in greenhouse trials. Measurements included aphid colony counts in tree canopies, root gall incidence, and predator (earwig) presence on treated and control trees.
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